Procedural memory is the memory that involves the learning of a skill. If you learn to knit a sweater, then you are using your procedural memory. This type of memory is often used without thinking about it. For example, if you have learned how to ride a bike, you no longer have to consciously think about pedaling; your body just does it. Procedural memory is very long lasting. Once we learn something in this way, it is very difficult to unlearn it. Hence the phrase, “It’s like riding a bike.”
Some evidence seems to show that the cerebellum and basal ganglia are the parts of the brain that are primarily responsible for this type of memory and that the hippocampus has little involvement. This may be why people with Alzheimer’s Disease rarely lose their procedural memory.